Governor-operated switch



Jan. l0, 1928. 1,655,408

i J.E.BOYcE GovERNoR OPERATED swTcH Filed sept. 29, 1925 O Y O /y la O O s Il G l0 O 7 o 3 /2 O 0 6 4 8 l I3 1=,-\ o 44 FII l; 4 I LS al 5 u.; l l sa 33 o 3 n' 47 i;

O ab@ l O 36 my@ ff casing 28 attached to base 1 by Patented Jan. l0, 1928.

UNITED STATES 1,655,408 PATENT OFFICE.

JOHN E. BOYCE, OF YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION F NEW JERSEY.

GOVERNOR-OPERATED SWITCH.

Application tiled September 29, 1923. Serial No. 665,694.

My invention relates to governor operated switches and has for its objects: first, the provision of a switch operable as a result of the speed of the governor exceeding a predetermined value and that will open its contacts with a quick break; second, a switch that will not allow its contacts to be re-closed by the action of the governor, but requires a manual operation to reclose them; and

third, a switch whose contact cannot be reclosed manually until the speed of the governor has fallen below a predetermined value or the governor is in its inoperated condition.

I attain these objects by the mechanism illustrated in the accompanying drawing.

The governor G and switch S are mounted on a base 1. The governor is the well known y ball type, consisting of a supporting pedestal 2, driving sheave 3, and bevel gear 4 mounted to revolve with shaft 5, the latter j ournaled in pedestal 2. Meshing with bevel gear 4, is another bevel gear 6 mounted to revolve with shaft 7, the latter journaled in support 8 which is rigidly fastened to pedestal 2. Loosely mounted on shaft 7 is collar 9. A link 10 is loosely attached to this collar by pin 11. A link 12- connects one end of link 10 to rigid support 8. A link 13 connects the other end of link 10 to one end of the switch operating cam 14, the latter being mounted to rotate on pin 15 in base 1. The collar 9 is attached to the fly balls 16 and 17 of the governor by links 18, 19, and 21. One end of links 2O and 21 is fastened to collar 22by pins 23 and 24. Collar 22 `is rigidly Jfastened to shaft 7 by -pin 25. The governor spring 26 is mounted over shaft, 7

between collar 9 and adjusting nuts 27. The' rotation of the driving sheave 3 results in a rotation of the ily balls with shaft 7. As'

the speed increases the fly balls move in an outward direction, drawing the collar. 9 upward against the sprinr 26, resulting in an upward movement of the left hand end of link 10, the link 13, and the right hand end of cam 14, and a downward movement of the left hand end of the cam 14. As the action of this type of governor is well known, it is thought that the above description is suiiicient to explain how the cam 14 is moved by the action of the governor.

The governor switch S is enclosed in a bolts 29. The casing may be provided with a cover governor pin 37 in bracket 35, the cover having an Oll opening to permit this rotative movement. A stop 38 for Contact arm 36 is a part of bracket The 'contact plate 39, contact plate insulator 40, tripping plate 41 and tripping plate insulator 42 are mounted on the contact arm 36. itself made of insulating material, and is provided with a beveled edge 43, which engages a catch 44 of latch 34. The catch is fitted to the beveled edge.

When the governor switch contact is closed, the action of the spring 45 in latch 34 causes the catch 44 to hold tripping' plate 41 so that contact plate 39 bridges the movable spring contacts 32 and 33. lVhcn the has speed, the left hand end of cam 14 comes into contact with the lower end of arm 36. A further increase in speed of the governor from this point will cause the cam 14 to push against arrn 36 and when this pressure becomes sutiicient to overcome the latching action of catch 44 on the beveled edge 43 of tripping plate 41, the switch arm 36 will snap out thereby making a quick break between the contact plate 39 and thecontacts 32 and 33. It will be noted that when the cam has moved the tripping plate to the point where the catch releases it, the pressure of the springs will snap the plate with its contact plate away from the other contacts of the switch and, therefore, there will be a quick break of the circuit through the contacts, which is desired because, when the governor attains the predetermined speed, the plan is not only to separate the contacts of the switch at that time but also to break the circuit through the contacts. Of course a quick break of the contacts is a desirable object as it prevents arcing, thereby increasing the life of the contacts, but the principal object or advantage of a quick break in a governor operated switch is that the circuit controlled by this switch is thereby opened at a4 denite or predetermined speedof the governor, the'quick break of the The tripping ,plate 41 is attained a predetermined l end of the arm strikes the stop 38. This contact arm will remain in the open position until reset manually, as a reduction of the governor speed and consequent vmotion of cam 14 will not affect the position of the contact arm 36. Furthermore, the contact arm cannot be reset manually until the speed of the governor has fallen sufciently s o that the contact arm 36 will notv strike the cam 14 when an attempt is made to close the contact.

A lead wire 46 -is brought out from contact 32and a lead wire 47 from contact 33, These two leads are connected in the electric circuit to be controlled by the. governor Switch. v i

From-the above description, it is evident that the contact of the overnor switch will be broken quickly and rthermore the contact will not be closed bythe laction of the governor. but will have to be closed manually after once opening, and also that the con-A tact cannot be closed manually until the speed of the governor has fallen below a predetermined value.

What I claim is:

'1. In combination, a governor, a pivoted cam, linkage connecting said camand said governor for causing movement of said cam' about its 'pivot upon'va change in the value' of the speed of said governor, a switch having a pivoted operatin v leverdisposed in the path of movement o said cam, said cam engaging said lever to cause the opening of said switch when the speed of the governor attains a predetermined value and thereafter permitting the switch to remain open regardless of the speed of the governor but preventing the reclosure of the switch until after the speed of the governor has fallen below a predetermined value.

-2. In combination, a switch comprising, a spring'contact, an arm carrying a Contact plate bearing against said spring contact when the switch is closed, and a spring latch for engaging said arm; when in latched'po- .sition, to hold said contact plate against said spring contactand, upon disengagement of said arm from said latch, for moving said arm to cause quick separation of -said spring contact and contact plate, a governor, and means operated by the governor to move said arm to cause its disengagement from governor attainsa presaid latch when the determined speed.

3. A governor; a switch comprising',

spring contacts, a tripping plate carrymg a contact plate adapted to bear against saidv spring contacts, said tripping plate having a double beveled edge, and a spring latch having' 'a catch fitted to said beveled edge; and means vadapted to be operated by the governor at a predetermined speed to release said' tripping plate from said 1atch,. 'whereby a quick separation of said spring contacts and contact plate is obtained.

vIn testimony whereof, l-'have signed my name to this speciiicationt'" A JOHN E. BOYCE. 

